For the PC to create 2D animation in the cut-out style.
Main features are:
real-time editing previewing,
automatic in-betweening,
freedom of graphical style,
combining bitmaps with vector graphics.
Pencil is an animation/drawing software for Mac OS X, Windows, and Linux. It lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics. Pencil is free and open source.